Accuracy evaluation of a six-degree-of-freedom couch using cone beam CT and IsoCal phantom with an in-house algorithm

Medical Physics
Qinghui ZhangEric E Klein

Abstract

The accuracy of a six degree of freedom (6DoF) couch was evaluated using a novel method. Cone beam CT (CBCT) images of a 3D phantom (IsoCal) were acquired with different, known combinations of couch pitch and roll angles. Pitch and roll angles between the maximum allowable values of 357 and 3 degrees were tested in one degree increments. A total of 49 combinations were tested at 0 degrees of yaw (couch rotation angle). The 3D positions of 16 tungsten carbide ball bearings (BBs), each 4 mm in diameter and arranged in a known geometry within the IsoCal phantom, were determined in the 49 image sets with in-house software. The BB positions at different rotation angles were determined using a rotation matrix from the original BB positions at zero pitch and roll angles. A linear least squares fit method estimated the rotation angles and differences between detected and nominal rotation angles were calculated. This study was conducted for the case with and without extra weight on the couch. Couch walk shifts for the system were investigated using eight combinations of rotation, roll and pitch. A total of 49 CBCT images with voxel sizes 0.5 × 0.5 × 1.0 mm(3) were taken for the case without extra weight on the couch. The 16 BBs were det...Continue Reading

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Citations

Jun 22, 2019·Journal of Applied Clinical Medical Physics·Hidetoshi ShimizuTakeshi Kodaira
Jul 30, 2019·Journal of Applied Clinical Medical Physics·Ryohei MiyasakaRyusuke Hara
Mar 14, 2020·Cancer radiothérapie : journal de la Société française de radiothérapie oncologique·J-L DumasL de Marzi

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